use type checkers

[simonpcouch]

It's time to do the thing🏄

We already have the import-standalone_* from #1091. I propose we split this up into a few PRs and scope this as type checking all arguments to exported, non@keywords internal or dot-prefixed functions:

• transition to rlang type checkers in update() methods #1177
• transition to rlang type checkers in aaa_models.R #1179
• transition to rlang type checkers in fit.R #1181
• transition to rlang type checkers in prediction functions #1183
• transition to rlang type checkers in remaining functions #1185

Notably, we can't type check main model arguments in the usual way due to their data-env trick.

[simonpcouch]

🏄

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